Four component microscope eyepiece

ABSTRACT

This invention relates to a microscope eyepiece having a magnification of substantially 6.3X, an apparent field of view of substantially 38.6*, and a maximum exit pupil diameter of substantially 2.56 millimeters.

United Stat 1111 3,788,732

Shoemaker Jan. 29, 1974 [54] FOUR COMPONENT MICROSCOPE 3.623.791 11/1971 Uetake 350/175 E x EYEPIECE [75] Inventor: Arthur H. Shoemaker, Aurora, N.Y.

Primary Exammer-John K. Corbm [73] Assignee: American Optical Corporation, Attorney, Agent, or Firm-Alan H. Spencer; William Southbridge, Mass. C. Nealon [22] Filed: Sept. 11, 1972 [21] Appl. No.: 288,208

- [57] ABSTRACT [52] US. Cl. 350/220, 350/175 E [51] Int. Cl. t. G02b 25/00 This inv ntion rel te to a micros ope eyepiece having [58] Field of Search 350/ 175 E, 220 a magnification of substantially 6.3x, an apparent field of view of substantially 38.6, and a maximum [56] References Cited exit pupil diameter of substantially 2.56 millimeters.

UNITED STATES PATENTS 3,638,996 2/1972 Klein 350/175 E X 3 Claims, 1 Drawing Figure PLANE (DIAPHRAM) 5 1 I 50 mmmm 29 um 3788.732

TELESCOPE FOc L 5 2 PLANE (0) t I EYEP/ECE FOCAL PLANE (D/APHRAM) 5 1 0 1 2' FOUR COMPONENT MICROSCOPE EYEPIECE F=39.65 MAGNIFICA'IION=6.3X

Refractive Abbe BACKGROUND OF THE INVENTION g 3 "1%" umber L V This invention relates to improvements in an eye- 5 piece for microscopes, and in particular to an eyepiece R1=26 47 with a magnification of substantially 6.3X, an apparent R2 330 03 'I1=8.00 NDI=L6968 14:56.15 field of view of substantially 38.6, and a maximum exit pupil diameter of substantially 2.56 millimeters. The R3= 28 715 32:23-75) objects of this invention are to provide an eyepiece l Kb 00 T2=1-50 ND2=L74077 v2=27.60 which lSZ 53:3974

I. well corrected for the usual field aberrations, espe- R= 86-4 T3=4-000 ND3=L60140 13:38 23 cially coma, astigmatism and distortion, while hav- 3 T4 10 107 ND4 17335O 4:165 ing a substantially flat field of view; and having a v a predetermined amount of lateral color to compen- I5 R8=25 03 54:02) sate residuals in the microscope objectives, while 2503 T5=10J07 ND5=1.73350 5=51.s5 yet having a color free diaphragm; T6=4.00 ND6=1.60140 v6=38.23 2. well corrected for the pupil aberrations, especially R10=86A 35:18

pupil color and spherical aberration when used in conjunction with a telescope objective and associated prisms as part of an afocal viewing system in an infinity corrected microscope. I The Petzval radius is 7.5F for this eyepiece providing In the ff f tables negafwe Slgns represent excellent image quality over the entire field of view. cave a gomg m left to "8 I The eye-relief provided is 0.47F; which is adequate for Havmg E 9 the mvem'on m data and comfortable viewing with or without eyeglasses with sufficient particularity to enable those skilled in the art to practice it, what is desired to have protected by Letters Patent is set forth in the following claims. What is claimed is: DRAWING l. A four component microscope eyepiece having a The drawing is an optical diagram of a microscope magnification of substantially 6.3X, an apparent field y p according to the present invention of view of substantially 38.6", a maximum exit pupil diameter of substantially 2.56 millimeters, a Petzval radius of 7.5 F, and having an eye relief of 0.47F wherein DESCRIPTION F is the focal length, and characterized by good correction for pupil aberrations, pupil color and spherical ab- The parameters of the lens le n Whlch make P erration when used in conjunction with a telescope obthe objective 3."? listed in the following table in WhlCh jectjve and associated prisms as part of an afoca] iew- ND is the refractive index for the D line of sodlum and i System i an i fi i correcting System d -i v is the A u ad thicknesses and ing the following components in optical alignment: a p ng are expresed in millimeters and a negative convex-concave lens I; a double concave negative lens sign indicates lens radii on centers of curvature on the I]; a d bl Ill consisting f a d bl concave negative object side of the lens. lens cemented to a double convex lens, and a doublet Refractive Abbe Radius Thickness Space index number R T S ND u S0=0.4015F R1 0.6676F T1=0.2018F ND1=1.69680 vI=56.15 R2=8.3236F I S1=0.l663F S2=0.2207F R3=-0. 72421 T2=0. 037915 ND2=1. 74077 v2=27.60 R4=0.4288F S3=0.0775F R5= 2.1791F T3=0.1009F ND3=L60140 v3=38.23 R6=0.6313F T4=0.2549F ND4=L73350 v4=51.65 R7= 0.6313F S4=0.0051F R8=0.6313F T5=0. 254% ND5=L73350 v5=5l.65 R9=0.63I3F T6=0.1009F ND6=1.60140 u6=38.23 R10=2.1791F The foregoing parameters of radius, thickness, and

IV, consisting of a double convex lens cemented to a spacings are functions of the equivalent focal length F double concave negative lens.

of the objective. The value of as an example is 39.65 millimeters. In this focal length, the absolute values of the foregoing data is as follows:

2. The microscope eyepiece of claim 1 in which the parameters oflens radii (R), thicknesses (T), and spacings (S) are expressed in millimeters and a negative 

1. A four component microscope eyepiece having a magnification of substantially 6.3X, an apparent field of view of substantially 38.6*, a maximum exit pupil diameter of substantially 2.56 millimeters, a Petzval radius of 7.5F, and having an eye relief of 0.47F wherein F is the focal length, and characterized by good correction for pupil aberrations, pupil color and spherical aberration when used in conjunction with a telescope objective and associated prisms as part of an afocal viewing system in an infinity correcting system and comprising the following components in optical alignment: a convex-concave lens I; a double concave negative lens II; a double III consisting of a double concave negative lens cemented to a double convex lens, and a doublet IV, consisting of a double convex lens cemented to a double concave negative lens.
 2. The microscope eyepiece of claim 1 in which the parameters of lens radii (R), thicknesses (T), and spacings (S) are expRessed in millimeters and a negative sign indicates lens radii on centers of curvature on the object side of the lens
 3. The microscope eyepiece of claim 2 in which F 39.65. 